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Compared with SYN cache method, SYN? Cookies technology does not need to allocate space at all when receiving a SYN. Because the most basic data that make up the connection state are encoded and compressed into the sequence number bits of SYN-ACK. For a legitimate connection, the server will receive an ACK message segment with a serial number (actually the serial number has been added by 1), then the basic TCB data will be regenerated, and a complete TCB will confirm that the data will be safely instantiated through decompression. This decompression can be successful even under severe attacks, because there is no storage load at all on the host side, only the load that calculates the encoded data into the ACK sequence number. The disadvantage is that not all TCB data can be added to the 32-bit sequence number segment, so some TCP options required for high performance cannot be encoded. Another problem is that such SYN-ACK message segments will not be forwarded (because forwarding requires complete state data).Of course, the software design pattern is only a guide. In actual software development, it must be selected according to specific requirements:/massage (massage)好友田村突然在旅游时发生事故死亡，另一好友美惠自杀，编辑部里的老师又突然住院很快病危，同事国中乘坐出租车发生不测……接二连三的事故现场，筱原都看到同一个身着和服的小女孩。（保坂尚輝、浅香唯饰）There are about 4,000 species of known medicinal plants throughout Europe, of which more than 300 are used as medicines. Is only China still using botanical drugs? No ~ No ~ No ~ In Europe, its long history can be traced back to Hippocrates in ancient Greece. As for Hippocrates' specific glorious deeds, please Baidu yourself, because I don't know, the history class was skipped by me.香儿觉得，做人要实诚，她自小就信奉一条：坚决不说谎。With the task guiding role growth as the center, combined with replica, PVP and PVE as the auxiliary, it has the same changes in equipment and grade as other online games, and has a total of more than 600 kinds of equipment props.